The number of moles present in 36 g of water is
Correct answer: C. 2
- A. 0.5
- B. 1
- C. 2
- D. 18
Explanation
The molar mass of water is 2(1) + 16, that is 18 g per mole, so 36 divided by 18 gives 2 moles. Those 2 moles contain 1.204 x 10^24 water molecules. The figure 18 is the molar mass itself and is offered because candidates who divide the wrong way round arrive at it.
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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